The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
May. 18, 1989
Osamu Tajima, Ibaraki, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
Disclosed are an information signal recording medium having pits which are formed in a geometric concave or convex configuration for recording information signals and on which a light spot is applied for reproduction of the information signals, a recording apparatus for optically recording the information signals thereon and a reproducing apparatus for optically reproducing the information signals therefrom. In the information signal recording medium, a pit width of a first pit having a pit length substantially equal to half the longest recording wavelength is set to a first pit width smaller than the diameter of the light spot, a pit width of a second pit having a pit length substantially equal of half the shortest recording wavelength is set to a second pit width greater in dimension than the first pit width, and a pit width of a third pit having a pit length in-between the pit length substantially equal to half the longest recording wavelength and the pit length substantially equal to half the shortest recording wavelength is set to be equal to a pit width of a fourth pit having a pit length shorter than the pit length of the third pit or set to be smaller than the pit width of the fourth pit.